Dramatic drop in estrogen?


I’m 38, getting ready to start my 3rd round of <a href="https://glowing.com/glow-fertility-program">IVF</a> and needed to get my day 3 labs done again. In the last two years (and as recently as 5 months ago), my estrogen has been 70-90 range. Today it was 10, and the normal range is 12-233!! Does anybody have experience with a drop like this? Am I starting menopause? Seeing the doctor soon, but want to hear if anyone else has had this experience.